// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

window.CodeMirror = {};

(function() {
  'use strict';

  function splitLines(string) {
    return string.split(/\r?\n|\r/);
  }

  function StringStream(string) {
    this.pos = this.start = 0;
    this.string = string;
    this.lineStart = 0;
  }
  StringStream.prototype = {
    eol: function() {
      return this.pos >= this.string.length;
    },
    sol: function() {
      return this.pos == 0;
    },
    peek: function() {
      return this.string.charAt(this.pos) || null;
    },
    next: function() {
      if (this.pos < this.string.length) return this.string.charAt(this.pos++);
    },
    eat: function(match) {
      var ch = this.string.charAt(this.pos);
      if (typeof match == 'string') var ok = ch == match;
      else var ok = ch && (match.test ? match.test(ch) : match(ch));
      if (ok) {
        ++this.pos;
        return ch;
      }
    },
    eatWhile: function(match) {
      var start = this.pos;
      while (this.eat(match)) {}
      return this.pos > start;
    },
    eatSpace: function() {
      var start = this.pos;
      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
      return this.pos > start;
    },
    skipToEnd: function() {
      this.pos = this.string.length;
    },
    skipTo: function(ch) {
      var found = this.string.indexOf(ch, this.pos);
      if (found > -1) {
        this.pos = found;
        return true;
      }
    },
    backUp: function(n) {
      this.pos -= n;
    },
    column: function() {
      return this.start - this.lineStart;
    },
    indentation: function() {
      return 0;
    },
    match: function(pattern, consume, caseInsensitive) {
      if (typeof pattern == 'string') {
        var cased = function(str) {
          return caseInsensitive ? str.toLowerCase() : str;
        };
        var substr = this.string.substr(this.pos, pattern.length);
        if (cased(substr) == cased(pattern)) {
          if (consume !== false) this.pos += pattern.length;
          return true;
        }
      } else {
        var match = this.string.slice(this.pos).match(pattern);
        if (match && match.index > 0) return null;
        if (match && consume !== false) this.pos += match[0].length;
        return match;
      }
    },
    current: function() {
      return this.string.slice(this.start, this.pos);
    },
    hideFirstChars: function(n, inner) {
      this.lineStart += n;
      try {
        return inner();
      } finally {
        this.lineStart -= n;
      }
    },
    lookAhead: function() {
      return null;
    },
  };
  CodeMirror.StringStream = StringStream;

  CodeMirror.startState = function(mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true;
  };

  var modes = (CodeMirror.modes = {}),
    mimeModes = (CodeMirror.mimeModes = {});
  CodeMirror.defineMode = function(name, mode) {
    if (arguments.length > 2)
      mode.dependencies = Array.prototype.slice.call(arguments, 2);
    modes[name] = mode;
  };
  CodeMirror.defineMIME = function(mime, spec) {
    mimeModes[mime] = spec;
  };
  CodeMirror.resolveMode = function(spec) {
    if (typeof spec == 'string' && mimeModes.hasOwnProperty(spec)) {
      spec = mimeModes[spec];
    } else if (
      spec &&
      typeof spec.name == 'string' &&
      mimeModes.hasOwnProperty(spec.name)
    ) {
      spec = mimeModes[spec.name];
    }
    if (typeof spec == 'string') return { name: spec };
    else return spec || { name: 'null' };
  };
  CodeMirror.getMode = function(options, spec) {
    spec = CodeMirror.resolveMode(spec);
    var mfactory = modes[spec.name];
    if (!mfactory) throw new Error('Unknown mode: ' + spec);
    return mfactory(options, spec);
  };
  CodeMirror.registerHelper = CodeMirror.registerGlobalHelper = Math.min;
  CodeMirror.defineMode('null', function() {
    return {
      token: function(stream) {
        stream.skipToEnd();
      },
    };
  });
  CodeMirror.defineMIME('text/plain', 'null');

  CodeMirror.runMode = function(string, modespec, callback, options) {
    var mode = CodeMirror.getMode({ indentUnit: 2 }, modespec);

    if (callback.nodeType == 1) {
      var tabSize = (options && options.tabSize) || 4;
      var node = callback,
        col = 0;
      node.innerHTML = '';
      callback = function(text, style) {
        if (text == '\n') {
          node.appendChild(document.createElement('br'));
          col = 0;
          return;
        }
        var content = '';
        // replace tabs
        for (var pos = 0; ; ) {
          var idx = text.indexOf('\t', pos);
          if (idx == -1) {
            content += text.slice(pos);
            col += text.length - pos;
            break;
          } else {
            col += idx - pos;
            content += text.slice(pos, idx);
            var size = tabSize - (col % tabSize);
            col += size;
            for (var i = 0; i < size; ++i) content += ' ';
            pos = idx + 1;
          }
        }

        if (style) {
          var sp = node.appendChild(document.createElement('span'));
          sp.className = 'cm-' + style.replace(/ +/g, ' cm-');
          sp.appendChild(document.createTextNode(content));
        } else {
          node.appendChild(document.createTextNode(content));
        }
      };
    }

    var lines = splitLines(string),
      state = (options && options.state) || CodeMirror.startState(mode);
    for (var i = 0, e = lines.length; i < e; ++i) {
      if (i) callback('\n');
      var stream = new CodeMirror.StringStream(lines[i]);
      if (!stream.string && mode.blankLine) mode.blankLine(state);
      while (!stream.eol()) {
        var style = mode.token(stream, state);
        callback(stream.current(), style, i, stream.start, state);
        stream.start = stream.pos;
      }
    }
  };
})();
